<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                   <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                   </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                   <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
                        <div class="button">{{item.name}}</div>
                   </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) of cities" ::key="key" :ref="key"> 
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id"
                    @click="handleCityClick(innerItem.name)"
                    >{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
    import BScroll from 'better-scroll'
    import {
        mapState
    } from 'vuex'
    export default {
        name: 'CityList',
        props: {
            hot: Array,
            cities: Object,
            letter: String
        },
        methods: {
            handleCityClick(city) {
                this.$store.dispatch('changeCity', city);
                this.$router.push('/');
            }
        },
        mounted() {
            this.scroll = new BScroll(this.$refs.wrapper)
        },
        computed: {
            ...mapState({
                currentCity: 'city'
            })
        },
        watch: {
            letter() {
                if (this.letter) {
                    const element = this.$refs[this.letter][0];
                    this.scroll.scrollToElement(element)
                }
            }
        }
    }
</script>

<style lang="scss" scoped>
    @import '~@/assets/style/varibles.scss';
    .border-topbottom {
        &:before {
            border-color: #ccc;
        }
        &:after {
            border-color: #ccc;
        }
    }
    
    .border-bottom {
        &:before {
            border-color: #ccc;
        }
    }
    
    .list {
        overflow: hidden;
        position: absolute;
        top: 1.58rem;
        left: 0;
        right: 0;
        bottom: 0;
    }
    
    .title {
        line-height: .54rem;
        background-color: #eee;
        padding-left: .2rem;
        color: #666;
        font-size: .26rem;
    }
    
    .button-list {
        overflow: hidden;
        padding: .1rem .6rem .1rem .1rem;
        .button-wrapper {
            float: left;
            width: 33.33%;
            .button {
                padding: .1rem;
                text-align: center;
                margin: .1rem;
                border: .02rem solid #ccc;
                padding: .01rem 0;
                border-radius: .06rem;
            }
        }
    }
    
    .item-list {
        line-height: .76rem;
        padding-left: .2rem;
    }
</style>